A. -1
B. 1
C. 0
D. none
If the 2nd term in the expansion (13√a+a/√a-1) is 14a5/2, then the value of nC3/nC2 is
k.C0+k2.C1/2+K2. C2/3+.…………+kn+1.Cn/n+1 =
If x+y=1, then 2.nCrxr.yn-r =
2.C2+6.C3+12.C4+……….+n(n-1)Cn =
If the sum of the coefficients of (1+2x)n is 6561, then the greatest coefficient is
If (1+x+x2)n =Σr=02n rxr then a0+a2+a4+……….+a2n=
If n is a positive integer, then value of (3n+2)nC0+(3n-1) nC1+(3n-4) nC2+……..+ 2(nCn) is
The middle term of (1-3x+3x2-x3)2n is
(1.03)19 =
x2n-1+y2n-1 is divisible by x+y if n is